Issue 1, 2021, Issue in Progress
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RSC Advances

Al-doping enables high stability of single-crystalline LiNi0.7Co0.1Mn0.2O2 lithium-ion cathodes at high voltage†

Lei Cheng,a   Bao Zhang,a   Shi-Lin Su,a   Lei Ming, ORCID logo *a   Yi Zhaoa  and  Xin-Xin Tana  

* Corresponding authors

a School of Metallurgy and Environment, Central South University, Changsha 410083, P. R. China

Abstract

LiNi0.7Co0.1Mn0.2O2 (NCM) is a kind of promising cathode material for lithium ion batteries because of its high capacities. However, the further commercialization of this material has been seriously hindered by the unstable structure at a deep de-lithiation state. Herein, it is identified that this drawback can be diminished by Al-doping, which is inherently stable in the lattice framework to restrain the structural collapse of LiNi0.7Co0.1Mn0.2O2 at a high cut-off voltage (4.4 V). As expected, the Al-doped NCM (NCM–0.2Al) material obtains the highest reversible capacity and capacity retention (144.69 mA h g−1, 80.26%) after 90 cycles at 1C. The excellent performance demonstrates that Al-doping can effectively enhance the Li+-ion diffusion kinetic and structural stability of NCM, providing a feasible strategy for the further industrialization of Ni-rich materials.

Graphical abstract: Al-doping enables high stability of single-crystalline LiNi0.7Co0.1Mn0.2O2 lithium-ion cathodes at high voltage

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Article information

DOI
https://doi.org/10.1039/D0RA09813B
Article type
Paper
Submitted
19 Nov 2020
Accepted
09 Dec 2020
First published
22 Dec 2020
This article is Open Access
Creative Commons BY-NC license

RSC Adv., 2021,11, 124-128

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Al-doping enables high stability of single-crystalline LiNi0.7Co0.1Mn0.2O2 lithium-ion cathodes at high voltage

L. Cheng, B. Zhang, S. Su, L. Ming, Y. Zhao and X. Tan, RSC Adv., 2021, 11, 124 DOI: 10.1039/D0RA09813B

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